METAMERA: the segments into which the embryo breaks up.
METAMERISM: the segmentation of the embryo.
MONERA: the most primitive of the unicellular organisms.
MONISM: belief in the fundamental unity of all things.
MORPHOLOGY: the science of organic forms (generally equivalent to anatomy).
MYOTOMES: segments into which the muscles break up.
NEPHRA: the kidneys; hence:—
Nephridia: the rudimentary kidney-organs.
Nephrotomes: the segments of the developing kidneys.
ONTOGENY: the science of the development of the individual (generally equivalent to embryology).
PERIGENESIS: the genesis of the movements in the vital particles.
PHAGOCYTES: cells that absorb food (phagein = to eat).